noun, slang ·Uncommon ·College level

Definitions

Noun

1. 1
   A bird, the blue titmouse.

   "Mr. Hewitson mentions a pair of bluecaps having built their nest in a bottle[…]"

2. 2
   A fish of the salmon kind with blue spots on its head.
3. 3
   A Scotsman. colloquial
4. 4
   A tiny blue-skinned fairy that inhabits a mine and helps the miners.

Example

More examples

"Mr. Hewitson mentions a pair of bluecaps having built their nest in a bottle[…]"

Etymology

From blue + cap.

Related phrases

blue titmouse

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.